Ruby on Rails Hosting Service

Heroku is the instant ruby platform. Deploy any ruby app instantly with a simple and familiar git push. Take advantage of advanced features like HTTP caching, memcached, rack middleware, and instant scaling built into every app.

A Slicehost VPS fills the huge performance gap between entry-level, shared hosting and expensive dedicated hosting. Every Slice package gives you full root access, instant reboots, one of several Linux distributions and the ability to install whatever software you want. Slicehost is a Rackspace company.